The designation PLM80 clearly shows that this aircraft is what the French call a planeur leger motorise, which translates as motor glider rather than microlight. The prototype has hardly completed its first flights and exceeded most countries' definition of a microlight. In 1982, this latest product from Aerostructure was being test flown with a view to conventional certification.

Its structure is made entirely of glass-fibre laminates, as with all modern conventional gliders, and the PLM80 has a Worthmann FX66S-196V1 profile, set at 1½ degrees incidence and with the maximum coefficient of lift of 1.5. The drag coefficient 0.45. The wing is also fitted with air brakes, totalling 1.79 sq.ft (0.166sq.m) in surface area and which can travel from + 16 to -21%. The T-tail uses Worthmann FK71L 150/42.5 profiles vertical fin and 150/30 for the horizontal, with the latter installed at -2.5% incidence.

The engine is also a prototype, the three -cylinder French PAL640 from JPX, which was on static show at the end of July 1982 at Brienne le Chateau, the annual convention for European homebuilders. At that time it had just completed its bench testing. It drives a three-bladed propeller directly, of fixed pitch and 37 inch (0.93 m) diameter.